Sheet abrasive material



Patented Jan. 18, i927.

UNITED STATES I 1,614,618 PATENT OFFICE.

HENRY JOSEPH,'OF PITTSBURGH, PENNSYLVANIA ASSIGNOB TO UNITED STATES SAND PAPER COMPANY, OFWILLIAMSPORT, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

i No Drawing.

This invention relates to improvements in sheet abrasive material such as sandpaper, emery cloth, etc. a v

The new sheet abrasive material is of a b d o-mposite character and contains an inflammable or'combustible binder for binding the. abrasive to the flexible backing, but the com- .posite sheet abrasive is nevertheless as a whole fire proof or fire resistant, v The new sheet abrasive material has the flexible backing, such as paper or cloth, treated soas to make it fire proof or fire resistant, and the abrasive itself is also fire proof or fire esistant, sothat the combustible or infiamma le cementing material "which secures the abrasive to the flexible backing, is protected on one side by the abrasiveand on the other side by thefire proofbackilig. The cementing material, although inflammable orcombustible, is nevertheless thereby so protected that the composite sheet abrasive as a whole may be considered to be fire proof 'or fire resistant; When sheets of the abrasive are stacked together, the fire proof 5 abrasive comes in contact with the fire proof or fire resistant backing; and, during use of the abrasive, the combustible adhesive,'or cementing material, is likewise protected on both sides by incombustible or fire proofed material.

The cementing material employed .may be a material such asglue, either alone or combined with other substances, or it may be a cementing material which is water resistant or water repellant, such as an-zidhesive containing-resin, oils, etc. Such cementing material, both water soluble and water insoluble, are known in the art. Thecloth or paper or other amp e, fire pi'oofing materials may-be compounded with or used to impregnate the backing, and these materials may be either organic or inorganic compounds of suitable character to render the backing substantially fire proof. For example, the fire proofing materials may be inorganic salts, such as for example, ammonium phosphate or ammonium sulfate, or organic compounds such as for example, triphenylphosphate.

The treatment of the paper or.cloth or other backing with the fire proofing material may be 'e'fiected in various ways. For example, the cloth or paperbacking may be HEET ABRA SIVE MATERIAL.

Application filed June 26,1926. Serial No. 118,860.

treated-or impregnated with a solution of the fire proofing agent or agents, or the fire proofing agent or agents may be used and Incorporated into the paper or cloth during its manufacture in order to. render it fire proof or fire resistant. A-saturat'ed aqueous 00 solution of ammonium sulfate is satisfac- .toryfor this purpose. The solution may be applied 'hot or cold to the paper or fabric,- and the treated paper or fabric then allowed to dry in'tbe air, or dried in a drying room, as b so that the backing is in a dry state before the binder or adhesive is applied. I

While the fabric or paper backing may be fire proofed only on the back side and ma be left unfireproofed on the side to whic the'adhesive 1s applied, it may nevertheless advantageously be treated as a whole so that both sides of the paper or fabric backing are fire proofed before the adhesive or cementing material is applied thereto. "[5 After the paper or fabric backing is rendered fire proof, the cementing. or adhesive ,material may be applied thereto, and'the abrasive, such as emery powder, glass'pow- I der, etc.,may then be applied and the re sulting product dried or cured in the usual manner.

'-In order that the composite product of the invention'may be waterproof as well as fire proofed, the paper or cloth or other backing s5 may be subjected to a water proofing treatment as well as to a fire proofing treatment. For example, the cloth or paper backing may be treated with a solution of a suitable varnish or other water proofing compounds, and the treatment of the fabric or paper l with the fire proofing agent-may be carried backing may be fire proofed in ,various ways. For ex-' out'simultaneously, or the two operations I can be carried out successively. In either case, the backing will be both waterproofed andfire proofed; and, wherethe adhesive or cementing material is also of ,a water whichis nevertheless effectively fire proofed by enclosing it between the fire proof abras iv'e and the fire proof orfire resistant back 1n k in my U.- S.'Patent No. 1,591,001, dated June 29, 1926, .I have described and claimed a flexible sheet abrasive material in which the adhesive is itself fire proofedr The present invention is differentiated from that set forth in my said patent by the fact that the adhesive material is not itself compounded with fire proofing material or otherwise directly fire proof; but it is nevertheless so.

confined between the fire proof abrasive and the fire proofed backing that it is effectively fire proof.

I claim:

1. A flexible sheet abrasive material comprising a flexible backing which is fire proof or fire resistant, an abrasive which is a'l'so fire proof or fire resistant, and a combustibacking.

2. A flexible sheet abrasive material comprising a flexible fire proofed or fire resistant backing, an abrasive which is also fire proof or fire resistant and a combustible water proof adhesive for securing the abrasive to the backing, and the hacking also being water proofed, whereby the composite prodnet as a whole is water proof, and whereby the combustible adhesive is confined between fire proof or fire resistant layers of material.

In testimony whereof I aflix my signature.

HENRY JOSEPH,

ble adhesive uniting the abrasive to the 

